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Re:Why Japan is so successful at returning lost property by yorwba on Wednesday January 15, 2020 @06:03PM (#22059792)
There have been 559,789 naturalizations total from 1952 to 2018: http://www.moj.go.jp/content/001180510.pdf

Many of those have probably died by now, but likely not without leaving a few descendants. So there may be a million or so Japanese citizens with a family background involving migration within the last few generations.

Ainu, Ryukyuans and Burakumin should probably also be counted as "non-homogeneous", even though they're not "foreign".

Re:Why Japan is so successful at returning lost property by NalNezumi on Wednesday January 15, 2020 @08:00PM (#22060659)
besides from naturalizations, there's also quite few half-japanese people that acquire citizenship by birth-right. Although I'm pretty sure the wide consensus in Japan is that half-japanese is considered non-japanese, so the number would go down a little bit more.
Re:Why Japan is so successful at returning lost property by acidtoyman on Wednesday January 15, 2020 @11:27PM (#22061689)
Do you have a source for that? It's certainly not the legal case.